Step 1

Preheat the oven to Grease a 14 inch rimmed pizza pan. Set aside.

Step 2

In a large bowl or the bowl of a stand mixer, beat together the butter, sugar, and brown sugar. Add the vanilla and eggs, and beat until smooth.

Step 3

Add the flour, salt, and baking soda, and mix until just combined.

Step 4

In a small bowl, mix together the semisweet chips, white chocolate chips, and walnuts. Fold about 3/4 of the chocolate chips and walnuts into the dough.

Step 5

Spread the cookie dough in an evenly layer on the prepared pan, then sprinkle the remaining chocolate chips and walnuts on top.

Step 6

Bake 18-20 minutes, or until golden brown.